Talk to Gynecologist on Lices Infection And Body Allergy

Aoa.. I am 16 weeks pregnant 24 years age.. It's about one month I am having lices infection when I itch in my head peep or water type something feel due to this infection. I had developed guilty on lower back of my head. My head hurts. The skin Dr prescribed me sacribid peementhin 5% lotion, fucid cream, melon lotion and delice shampoo I have used it for 2 weeks in first week head infection goes but it's apeear again and now its not curing. For body allaeegy my Dr prescribed me avil medicine.. Kindly help me out in this severe allergy.. TIA