The irritability, lack of sleep, hungry but not eating sounds like it could be a manic episode begining. The disassociation is also possible, I have very "unconnected" days where I float along but not to that extent. But it is different for everyone and its important to tell your doctor everything. Mania can exhibit differently. I stop caring about everything. Risky behaviour. No consequences, insomnia, alcohol binges.

If you are really concerned I would say give your doctor a call and maybe they can give advice or get you in sooner.