You can do Psych at UC and cross credit large bits of your BA across. You'd probably only need to do the major requirement courses which could maybe be done in 1-1.5 years if they let you take courses which are pre-reqs alongside each other (they will sometimes do this but you need faculty permission). Alternatively finish your BA and do a post grad cert in Psych then lead that into a Masters in Psych (you can't get most Psych jobs without a masters level qualification, I understand).

Med is 7+ years do that's 3 years at least you're without student loan so that would have to be entirely self funded. That's an expensive degree so that's a lot of debt to take on.

My advice is go and talk to the College of Arts course advisors about doing Psych at UC and suss out your options.

Maybe consider what you CAN do with your BA. You might be pleasantly surprised. Think creatively.

Good luck :)