Glad you had a safe trip. It surely wasnt easy.
@georgechuks. I would suggest you don't rely much on getting foods from 7/11 because they are just foods for survival, not for enjoying eating. Try to enjoy street foods which are cheap and mostly delicious. If you are afraid of the spiciness, you can ask the cook to reduce it. If you are afraid of the hygiene, then choose from the conditions of the venders or restaurants you see. If you are not sure about the taste, then choose the ones many people line up for it.

I would suggest you as a tourist be ready to spend at least 10USD per day just for normal foods from normal restaurants or street venders. If you eat more fancy stuffs, you might need to triple up this amounts or even need more. Money for accommodation would depend on how you choose, but standard would be 20-50USD/night for cheap to moderately good hotels.

Also don't forget to try as many fruits as possible. Even some of them might look so strange, but all of them are good.

Also be aware that in many touristy places, there always the risk of getting scammed. Search online to read about their tricks before coming here. I think Thailand is quite safe, but it is better to be careful.