Millions have done it, you can to. LEt go of worrying about her, you have to save yourself first. Like in an airplane, first you have to put on your mask, only then can you rescue others...
I know this will sound funny, but at least for now you have to shelve your love for her and make yourself a priority (probably for the first time in your life). We have always been told that we mustn't be selfish,... But this it the exact time to be selfish and to take care of yourself first.