Cannabis is generally perceived as a harmless recreational drug but there has plenty of research over the last decade to show it increases one's risk of developing psychosis
later in life, especially if one starts the habit in teens and continues heavy intake for years. Of course everyone doesn't get affected, but for the few who do, life is never the same again.
The risk of developing anxiety
disorder is even higher than that of developing psychosis and that is an added disadvantage for you, since you say that you already suffer from anxiety.
Using cannabis to overcome negative feelings is like using a gun to kill a mosquito. I would rather prefer to add an SSRI
or escitalopram to your prescription, which would control both anxiety and negative feelings. Please discuss your problems in detail with your doctor, but if you are finding it difficult to communicate with him, ask your mother to intervene on your behalf. I am sure both your mother and your doctor are your well wishers and will advise what is best for you.