Hun, you have to eat. There are some great examples on here of different bariatric meal plans and guidelines that you could maybe pick from. If your surgeon literally said "eat whatever you want" then you might have to do some research on your own. Right now, your body is starving. So start off slow.
Try drinking 3 protein shakes per day and maybe some protein water or protein gatorade or protein juice. Most important is getting in your protein and hydration. Try that for a week or 2, then go down to 2 shakes per day and add in a meal of maybe hummus and avocado spread, or refried beans, or cottage cheese. After 2 weeks, I was having a tbsp of hummus and a tbsp of avocado spread for a meal.
After another week, go down to 1 shake and add scrambled egg, greek yogurt, and some soft (steamed) veggies like green beans, peas, carrots, or broccoli and cauliflower. By week 5, you can add in some chicken (it's a slider food, so don't over do it), black beans, cheeses, soft fruits (raspberries, blueberries, strawberries, blackberries, etc). Banana is you really want, but those can be higher in carbs, so go very easy on them.
By week 6, you can eat normally, but you tastes will likely change, and things you liked and tolerated before may be different now. So go slowly when trying new foods. This was the plan I followed. I also got a food scale to measure out my portion sizes until I learned to eyeball it and tell just by looking roughly how much I could have of something. You can do this...just go slow, do some research, and ask all the questions you want. That's why we're here