Well sleep can be the thing that cures all our ills. While we are asleep the brain and the body have the chance to regenerate and to make themselves right again Migraine can be very horrible and debilitating and until you have had one I do not think it is possible to know just how awful it is, people tend to think that it is 'just a headache' It is far more than that!

There is nothing in any medical archives that support your theory that these symptoms are the result of any spider envenomation.
I am not a doctor, but I would suspect that your symptoms may be more along the line of a vitamin deficiency, or cardiovascular condition.
I have had similar experiences, but I relate this to 'ageitis', and past physical trauma. I have had a fair share of spider bites, even a couple of widow bites. I have not seen any long term repercussions from this.

That is very useful advice Mettie and it proves that we cannot always take what we see on face value. It may seem like a migraine but it might not be, and it is certainly worth getting a definitive medical diagnosis so that you can be sure what you are dealing with here. I would be very interested to find out how you get on.