SHERWIT:
If I understand you correctly, you have had a professional relationship with the psychologist (doctor to psychologist), then there is the personal relationship? Is that right?
Do you anticipate that the professional relationship will continue?
I forgot to tell you that in one of the sms I started my message by hey there and he was angry about it... I did answer him and he re-contact me
What made him angry? The fact that you used "hey there"? Did he find that disrespectful?
If you think he is in an angry mood, you could choose to contact him the next day and give him a belated happy birthday. I can understand that you hesitate to contact him, while he is in an angry mood.