For a long time I tried to workout as much as possible at the level I used to, but I figured out that it really didn't work just because I was struggling so much overall. I would come back from a two mile run and just be dead and my pupils would become completely different sizes, and then I wouldn't run for three days because I pushed too hard. The same would be true for lifting. I would just be out of it mentally, my pupils would go to different sizes and my one eyelid would droop for a while. I have not tried lifting in a few months, but am hesitant to because my neck is still a problem for me. I starting biking lightly and have slowly been building up little by little with intensity, and I think I am ready to start running consistently again. It doesn't sound like you are very deconditioned like I was due to my insomnia and lack of ability to exercise much from it, but you really should be cautious. This short period in your life is not worth jeopardizing your health for the next 60+ years potentially. I thought I could just power through and throw as much weight on the bench as I always had, and it didn't work. Would the same be true a few months later? Maybe not but I'm still playing it safe and keeping myself aware of my limitations as one can easily loose sight of the bigger picture and push too hard working out paying for it later.