I understand how you feel, I FINALLY got on T on Monday, and I've been supposed to be getting on T since April. Things kept happening that pushed the date further and further back, and I can't even describe how awful it made me feel when it happened. I cried about it a lot, and it was extremely discouraging. But the day will come and when it does finally come you'll be super ready! Since you're starting potassium pills, did your doctor give you another possible date? You can also eat bananas, they help with potassium. I was extremely worried about if I'd start T on Monday because my doctor didn't like my cholesterol, but she gave me a list of things to do, and she still gave me the T. So hopefully next appointment your doctor will give you the okay!
I think almost every guy I've talked to has felt like this when trying to get on T, so just remember that you're not alone, and you WILL get there if you keep working.