Aw this must be really difficult. Although I can't say I've experienced separation anxiety as much as you have with pets, I can understand where you're coming from. And I'm not a councilor so I can't really tell you what to do, but I can try to help and encourage you to go to uni because it's so important to your future. Haru will always be there when you get back home and visit. 
I often miss my babs when we go on vacation and I find it hard to sleep without my fluffy bab with me ;-; But I know they'll be home waiting for me. (even if they don't show that they missed me I know they did haha)
Just understand that haru will also miss you and if he could talk he would probably skype you and tell you it'll be alright
I hope the best for you and your decision, and I'm always here if you need someone to talk to ;u;