Artifical sweeteners are a HUGE migraine trigger according to my pain doctor.
Contrary to others, motrin is NOT the best migraine medications. Triptans are specifically designed to treat migraine pain. For most migraine sufferers, motrin does very little to relieve the pain and other symptoms. I am glad that it helps some of you. There is another HUGE problem if you take motrin for migraines even once a week. Motrin and other NSAIDS can cause what is known as a rebound headache. The body thinks it NEEDS the motrin and creates a headache to get you to take it, rather than having other things trigger migraines. This has turned out to be a HUGE problem for many migraine patients, esp those who take excedrin (which is almost identical to excedrin migraine but has a far lower price tag here).
If you have more than 3 migraines a month, a preventative medicine is something to consider. There are a LOT of preventatives available and many of them are very inexpensive. When the $4 medication list came out the preventative I was on actually went UP in price to be on the list. You need to let your doctor know what is going on and if possible to keep a headache diary. there are many forms that you can print to use for this. You should also look up common migraine trigger foods and see if eliminating some or all will help. If you keep a diary, listing the processed foods you eat, esp the meats like bacon, hot dogs, etc..., and other trigger foods can help you find a pattern. Not all are as easy to see as you would think. If I eat more than 2 small servings of processed meat in a day, I have a migraine 2 days later. I was in some migraine research as a teen and this was the only real pattern we could find besides a huge reaction to MSG.
I also suggest taking a benadryl for a headache caused by artificial sweeteners. They don't "fix" the migraine, but for some people they do really help. Same thing for MSG headaches (used to be called chinese food migraines because so much MSG is put into chinese food or used to be). For me the benadryl helps the headache go away faster by calming reactions that help make it worse.
I hope your headache is gone, and that you can get some help preventing them and some more effective medications to treat them. If you cannot swallow triptans but they work, some come in injectable form and even a nasal inhaler form - at least imitrex used to. I know maxalt comes in tablets and in a tablet that dissolves under your tongue. That might help with the stomach/esophageal problems.