Hello! Please remember that my response is for information only, we are not establishing a therapeutic relationship.
I am glad that you have had a lot of good support, but it does sound like both the Psychiatrist and Therapist leaving were significant losses for you. 10 years is a long time. As a culture, we tend to rush people through the grieving process. Also, some people don't appreciate that losing therapists to a move/job change is a big loss that takes time to grieve.
So while grieving is normal and there's no "right" way or length of time, there does come a point when grieving becomes "complicated" --meaning that it's no longer "normal," but a problem. Complicated grieving is akin to being in "heightened," and "prolonged" state of grieving. I'm going to give you the signs of complicated grieving, and you can tell me if they any of them fit you or do not fit you and to what extent:
Extreme focus on the loss and reminders of the therapistsIntense longing or pining for themProblems accepting that they are goneNumbness or detachmentPreoccupation with your sorrowBitterness about your lossInability to enjoy lifeDepression or deep sadnessTrouble carrying out normal routinesWithdrawing from social activitiesFeeling that life holds no meaning or purposeIrritability or agitationLack of trust in others
Since you are already have replacements for your Psychiatrist and therapist, if you think your grieving has become complicated, it would be a good idea to discuss this with them --treatment for complicated grief generally includes therapy (similar to treating PTSD) and possibly antidepressants.
As far as the Psychiatrist giving you his number, I am wondering if he gave you any parameters/guidelines about when/under what circumstances it is OK to call, etc. If you are not clear, maybe you can ask him what he expects from you (is he saying it's OK to call if you have a major life event you want to share for example or was it to help transition from him to the new Psychiatrist?) If you are not clear what the boundaries are, I can see where it might not feel right to call him.
Please feel free to follow up with a response to this answer.