I believe these concerns would best be answered by your doctor and/or pharmacist.

Sometimes different meds are prescribed to help with different things that may be going on at the same time.

Other times one is prescribed to enhance the positive effects of another one being taken at the same time, or simply to offset any bad side effects the other may cause.

However, not being a doctor or pharmacist, I can't answer the reason why you were put on a cocktail, or whether any of the drugs prescribed will have bad interactions with one another.

Again, only your doctor or pharmacist can answer that.