Regarding panic attacks. Future plans.

Hello sir/madam,I am  getting treatment panic attacks due to which I could not concentrate in my daily life.i am consuming pari cr12.5,nexito forte,blonitas2 they proved to be effective but when i tried to stop taking medicines in 2 or 3 days I am facing effects of headache not even able to stand in one place shivering like happening actually I don't know what is the reason for my problem but my doctor suggested that it as the deficiency of serotonin secretion while taking medicines I feel ok but when I tried to get rid of medicines it became problem for me.please give solution to this problem and guide and suggest me the suitable ideas so that i can be recovered from this problem and to cope with my future plans.regards.