Hello and thanks for your query. I shall make an effort to provide you with good professional recommendations specific to your questions. As with all drugs, the benefits need to be reviewed with risks. If your indication for Phentermine is justified and is addressed to adequately then the above concerns will have to be overlooked gradually. Else, you would need a review with the same doctor for possible alternatives and change of drug if any because Phentermine does cause all your present issues as noted side effects. And these cannot be lowered by lowering the dose as this may not be useful for the indication itself. Let me know if I have missed out any other concern in your question. Yet again, I duly appreciate your query to me, I do hope that you have found something useful to help you and I shall be glad to answer any further apprehensions. Sincerely, Dr Sujeet N Charugulla, MBBS, MD. Consultant Physician.