Weekness and giddiness. Shift completes.

I am feeling a bit weekness and giddiness. Other all is fine. Please let me know the medicine which I should take for the same. Don't now why it happened to me I haven't stepped out of my house from last one month. Please let me know the medicine which I should take for the same. I am not able to sleep. Sleeping is also a issue for me from a very long time. Please guid me the same medicine for a sleep. It's the issue of my working shifts so I am facing the issue of sleep problem. My shift starts at 4 p.m. and ends at 2 a.m. after that I am not able to sleep till 6 or 7 a.m. dont know what's the matter for that please guide me the medicine of sleep so I could sleep on time as soon as my shift completes.