Extremely unlikely to be allergic to the hormones. Typically it is a reaction to the carrier oil. Definitely find out what it is and just avoid that in the future.
No need to waste your first cycle here on just anavar to cut down. Just fix diet and run some Cardarine. Save the gear for when you want to add mass. That is what they do.
That stack should work amazing for cutting. You might just have to make more adjustments to diet. It is likely not anything to do with calories but what you are eating specifically.
Glad you are using Umbrella man. If you do a quick search here for chemyo you will see so many bad reviews. Some really nasty side effects with their stuff.
Just make sure you have enough time training and pushing harder before running the test/var. Last thing you want to do is jump into a cycle, start lifting really heavy, and risk the injury again. Good luck with the surgery bro!