I am so sorry to hear about your problem. I know from a lot of experience that most doctors don't understand our brain problems. If you had only one TIA. It is nothing to worry about for now, though I know how scary it can be.
If you are able to do this, take an asprin a day. After my major stroke that is what I was told to do. It thins our blood and it seems that strokes and TIA's have to do with our blood being thick, the the best of the word.
But don't take asprin without asking you doctor, but may help. Don't worry buddy. You can get over this. Try to drink more water. as much as you can. Most of don't drink water like we should. Also after my stroke I had a potassium that was not in my body. Bananas far filled with potassium. So I try and eat at least one every day.
Please don't worry too much. Worry only makes your brain more stressed. I think you will be ok.