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First, breathe...
Three months is a long time. I wonder if it would help to see someone else during that time?? I think if my T was going to be gone for that long, and I knew a tough time was coming up for me (like the start of school for you), I would probably ask for a referral so I could have some support during that time. It wouldn't be the same as T, and we'd probably deal with different issues...more like "how do I get through this" than deeper stuff...but I still think it would be helpful.
Could you ask your T for a referral to get through that time?? I know it can't take the place of your T, but maybe it would help.

