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Headaches are a symptom of CFS. Do you know what kind of headache you have? That would help with treating it.
If it's a migraine then OTC meds can help, in particular Excedrin migraine. It has 3 active ingredients and works pretty well for some people. If OTCs aren't helping then there are quite a few prescription remedies.
If it's tension then neck stretching and strengthening exercises will help. Also make sure your environment is ergonomic. Yoga can help too.
It could be a trapped or pinched nerve. That's more difficult to treat and will probably require professional help.
Your headache could be a sinus headache, exacerbated by allergies, or it could be nonallergic rhinitis. If it's allergies then antihistamines and nasal sprays can help. If the latter then nasal sprays can help.
Some people get relief from ice packs, some people like hot packs. Some like to wrap their head in an elastic bandage, the pressure helps.
When was the last time you had your eyes checked? Might be time
for glasses or a new prescription.
One thing that I use for a headache that won't go away is a cortisone shot. It takes a day or two to kick in but when it does it's amazing.
There is a good headache book out there: http://www.amazon.com/Headache-Help-Understanding-Headaches-Medications/dp/0618044361/ref=sr_1_1?s=books&ie=UTF8&qid=1433463044&sr=1-1&keywords=headache+help
There are a shit ton of abortives and preventatives. There's a link to a list on the sidebar. The trick is finding the right ones for you. There are some OTC things but most things are prescription. I have found that as soon as you feel the first twinge of a headache take an abortive. It is much easier to nip in the bud than trying to treat a full blow headache. It's also better to take a preventative than solely rely on abortives. Preventatives don't prevent 100% of the headaches, but they can get the frequency way down.
A great book on headaches and meds is Headache Help.
You need a prophylactic medication. This could be an antidepressant or something else. See the sidebar for a list. When you feel the headache coming on take an abortive and lie down someplace dark and quiet for an hour or two and see if you can abort the headache.
To stay hydrated have a tablespoon of water or two at a time. Some people suck on ice chips. Ginger ale can supply hydration and help quell some nausea.
Triggers are very hard to identify. Because the trigger doesn't always trigger a headache and sometimes it's things in combinations. You need to start a diary and keep track of food, drink, activity, weather, smells, noise, light, etc... There are online sites to do this and even apps. Start noting the more popular triggers but note that you may be triggered by something unusual. Sometimes you can't find one at all, or it can be hormonal so you can't do much about it.
Google for a migraine specialist in your area.
A useful book: http://www.amazon.com/Headache-Help-Understanding-Headaches-Medications/dp/0618044361
You need a preventative. There are lots, the trick is finding the one that works for you. Antidepressants worked for me, both tricyclics and SSRIs. Now I take melatonin instead, and that works very well. I take magnesium as well. There are lots more options than that.
I wish the worksheet on the sidebar distinguished between abortives and preventatives, but it's a start.
There is a good book that describes all the various drugs. I bought it 20 years ago, I recently bought the latest version. It's a great reference as to what drugs are available for what type of headache. book link
One thing to remember is that your abortive or preventative may work for a while and then at some point stop working for you, so you have to find a different drug.
As far as your postdrome goes several people here have recommended Naturally Calm magnesium drink. I haven't had a chance to try it on a headache yet. If you're having brain fog then anything with electrolytes might help. Even a multivitamin and a big glass of water.
It's an art to find the right antidepressant for someone. I am pretty lucky in that most of them work for me. Lexapro had the fewest side effects. There are other preventatives. There is a book called "Headache Help" that details tons of drugs used for headache treatment. Very useful to know what options are available to you and then you can discuss them with the neuro. I don't know of a good resource that describes all the various antidepressants. Here's a table that compares some common types. I actually had a psychiatrist manage my migraine meds because they're the ones most familiar with the various ADs.
Also when taking an AD for migraine prevention you can usually get away with a lower dose than you would for depression.