I had the same - I lived on Gatorade and diet cordial until I found a soup I could stomach - I couldn’t do water. Little sips little sips. They told me at the time - don’t worry about diet right now just don’t get dehydrated. Then I moved onto a brand of high protein yogurt and lived on that for awhile until I could do purée. It wasn’t until about a month maybe 5 weeks before I could do protein shakes and get my numbers ideal. It is a big adjustment for you and your stomach. Be kind to yourself, the first few weeks are the hardest but it gets so much better.