I am unhappy with my job and I am not passionate whatsoever.

Do you actually think you are owed this? For the salary you are receiving?

If you are being paid fairly for the industry the answer is: no.

Computer science mentally exhausts and drains me, gives me so much stress and anxiety, and I do not feel confident in what i do.

That sounds like work to me. If it didn't suck you wouldn't get paid to do it.

I would like to go back to school to pursue a masters in psychology

You want you college years back. Everyone does.....you are living for free (not really, just seems like it).

i'm just worried because i don't know how the job prospect will be when the time comes.

Absolute shit compared to the money machine you are already participating in.

You need to figure out a work/life balance and some hobbies/interests outside of work.