Pregnancy and stress. Help/suggest.

I am 36 years old married female. We are trying to conceive and done some regular checkups. Doctor recommended me ovares plus n stimufol 2.5mg. also, I am suffering from insomnia and stress as I overthink alot. First of all , it takes me too much time to sleep, and once I go to sleep I see dreams frequently. I mean in a day 2-3 dreams (bad/good) daily. So, whenever I wakeup , I feel very tired. Entire day I feel exhausted. So, I went to psychiatrist. He recommended me flunil 20, tolaz dt 5, lamitor od 50. Though I  don't have any symptoms of listening voices n other such things. My only issue is sleepless nights, light sleep and frequent dreams. Sometimes. I m scared to use such high medicines related to my second problem. Please help/suggest.