It sounds like you've been so busy that all that work you've been doing has been a sort of distraction for how you feel, and now you don't have anything keeping you going, you've sort of, just stopped completely.
I do think it's a really good idea to go see your GP.
With the plan for Uni, maybe you could do a little at a time. Like look on the internet at one Uni one day, a different one the next day. You never know, once you start looking you might start to look forward to it. The hardest bit is always starting something.
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