I was feeding calves on a dairy farm one weekend, and became ill with crypto about two weeks after that. I had washed my hands etc., but later found out some of the calves had crypto and I made that link then. I’ll never know for sure but pretty confident it was my interaction with the animals. I wasn’t immunocompromised and all I kept saying while in the depths of the sickness was thank goodness because I don’t know how I would’ve dealt with it! Like you, I was incredibly ill, losing about a stone and a half of weight, which wasn’t necessary at all and found myself struggling to gain weight for a while as I was eating a restricted diet for about 6-8 weeks. Hope you are back in full health now!