hi there and welcome!
i do think seeing a qualified therapist would be such a benefit to you, and no, i don't think you are, or are going crazy.
I remember my daughter's freshman year of college. What a time for her!
You've had so much change in such a short time in your life. It can so increase anxiety and depression can creep in as well. Losing a beloved, almost life-long pet can be devastating. I'm sorry for your loss.
It sounds like you've had much change, and a massive loss, and are reacting to those. I think talking with a therapist about those will really help.
We're here too!
Good luck and please keep us posted on how you're doing!
KD