It is not advisable to conceal a relevant history from your doctor. That said, cannabis withdrawal is not known to cause physical sysmptoms. It is also likely that you have had anxiety for long which the cannabis had been masking and has only surfaced now after you stopped cannabis.
Also, medicines take a time of a minimum 2 weeks to show effect. Your doctor may prescribe some sos (take as needed) medication for the persisting anxiety.
Next Steps
Visit yojr psychiatrist and let him know your current complaints.
Health Tips
Meanwhile, do JPMR daily for 20 mins ( videos on youtube), square breathing to help with anxiety.