Hi Chloe

Yes. Giving yourself an appropriate length of time to adjust to being out of the hospital is a good idea. And a phased return generally work is best. And talking to your therapist about any difficulties you are experiencing in adjusting to the workplace would be helpful.
The thing is that you had good support from him before hospital and then that was withdrawn while you were in which could cause abandonment feelings. So long as you feel reasonably sure that he did not abandon you. the therapeutic relationship should go okay. Take care. I hope and pray all of this will work out well for you and your day will be really good. God bless and best wishes from your friend Francis