Severe migraine and vomiting after rides

What did you play in the metal band, drums or guitar? I've suffered from a few migraines previously, not cycling but when I was doing strenuous digging with a folding shovel on a military type thing overnight. I would suggest a likely cause is muscle tension in neck and shoulders caused by your position on the bike, and probably caused by your neck position playing in the band? As well as your doctor i would suggest seeing a bike fit specialist, preferably one who is also a qualified physiotherapist, or has good connections with one. Neck tension can be hideous. I've nearly fainted before walking to work with a crap backpack that was way too heavy pulling down on my shoulders. Ironically my wife is a physio and did a hospital rotation in hand therapy, which involved being hunched over other peoples hands all day. Suffered chronic headaches and migraines all the time which funnily enough went when she moved to something else! All caused by muscle tension.

Migraines are the absolute devil. I take it you have had them for some years and have the classic migraines rather than just headaches. Take a look at the Migraine Trust and the NHS websites re migraine triggers if you don't know them already. Such things as cheese, chocolate, red wine, not eating regularly, aspartame (in Diet Coke etc), looking at the sunrise, late nights, early nights... you can't win! As someone else mentioned it might be linked to neck/shoulder tension, and a cranial or ordinary osteopath might be able to put you right. Road bikes are not the most sensible things to ride for your posture, though wonderful of course. 

Quote:

Hydration - Well I dring plenty so much so that I end up with a clear stream

Very possible then that you are drinking too much water. Drink according to your thirst, don't try to drink ahead. I've seen it on a cycling holiday during "la canicule" in the South of France. It was very hot. The advice was to drink plenty. So one person drank, like, constantly. Ended up looking very pale and unwell, felt nauseous etc, so kept on drinking more water... Not good.

Google "hyponatremia". From the Wikipedia page:
"Mild symptoms include a decreased ability to think, headaches, nausea, and poor balance".

And as ever - I'm not qualified, speak to your doctor.

The doctor is the most important port of call, but I'll point out one area you haven't mentioned and is often missed which is diet - I had some quite nasty mental and physical health problems that weren't able to be diagnosed until I stopped consuming dairy, that changed things overnight for me. Doesn't hurt to try cutting things out for a while and see if anything changes

Thanks for sharing and glad you are under the car of a doctor, who will undoubtedly be the best person to advise you. 

Members of my family have suffered with migraines over the years and other than strong medication there has never been a solution. Nausea with migraines is common and the whilst exact causes of migraines seem unknown, certain triggers are recognised which may correlate with cycling:

• Strenuos exercise.
• Neck and shoulder tension.

Given you do not say how long you have been back cycling or how hard you push yourself, these may not be appropariate for yourself, but perhaps backing off a little and / or getting bike fit would help.

Either way utilise your doctor and best of luck.