cheating

I think my husband may be cheating on me, there are some signs I just dont know what to do, I am so frustrated and I can't seem to get any proof, every day I feel like I am going crazy so discouraged by all the events in my life.  I wish I was sleeping but I still have 6 more hours to finish on a 24 hour shift.  i am so edgy. I have been up since 415 am because I worked out before my shift.  I cant wait till 7 am so I can sleep and be away from all this pain in my soul.