“What’s my condition?”

Last week on Saturday I had a headache or migraine (not sure which one it is) and I only ate once that day which was 9 buffalo wings. On Sunday, I noticed | didn't have much of an appetite so I only ate a small amount of mashed potatoes with green beans. A couple hours later my stomach felt tight and when I stood up straight it didn’t make it feel any better. Later that night around 12am I vomited and could see what I ate which was the mashed potatoes and green beans. I vomited once more and it was clear fluid (assuming water I drunken). Three days after that, I feel fine and I’m able to eat but just not as much as usual. I can hold everything down and I even have cravings but I haven’t gotten a signal from my body that I’m hungry. Also, two days ago I got a sore on the roof of my mouth and another close by that’s at the roof of my mouth as well. It’s not that bothering & I think they’re canker sores so I’ve been doing salt water rinses ever since they appeared and they look like they’re getting a lot better (I attached photos and I’ll note that I have been drinking red Gatorade & not too sure if that has anything to do with the appearance). I believe it’s impossible for it to be cold sores or anything related to herpes, I’m sure. Another thing. Today I got headache on the right side on my forehead so I took a ibuprofen have been fine since. I should probably note that at times I noticed something I would describe as a pulsing feeling in my stomach or abdominal area but not near my navel or belly button. I want to also note that I have NOT been experiencing heartburn, diarrhea, fever, chills, sneezing, coughing, excessive sweating, excessive burping or farting, back pain, side pain, problems with my throat or chewing.