Will i have any physical harm done?

for the past year i have been taking alot of meds (recreationally) and drinking and smoking. i decides to stop 7 days ago and its been hard trying to stay sober but i've managed. i had some withdrawls along with it. i was taking sch. II narcotics, drinking, smoking weed on average 3 to 4 times a week. i plan on getting into good shape and get buff. will my organs and brain be ok? i plan on getting my doctorate in some medical field and i hope i havent killed to many brain cells. will i recover and be as good as new someday?