anyone experienced a severe stress reaction during your semester?

So for context I do suffer from a panic disorder and I am autistic, so im way more prone to stress in general. However the panic attack have been under control for a loooong time, but they have been appearing VERY frequently this last month. Even when im not panicking, my body just feels unsafe I guess, shaky, heavy and tight.

I just finished my last exam this semester, and am finally going on summer vacation, but I dont feel relaxed at all, I still feel really really bad. What should I do? reduce my workload next semester? any other tips to manage stress before it gets so bad?