Is it normal to go through this cycle each day.

I wake up in the morning and I stra away go on my phone for 30mins, I get a bath etc then I have my breakfast, at this poit I'm always somewhat modest when I go out i feel on top of the world and optimistic I'm very happy, but when I get back home and lay in bed I get really dark thoughts about worthlessness and about never amounting to anything I get suesideal thoughts more often then not and each time I get them I come closer and closer to actually doing it. My mood swings are ridiculous I never speak to my family and I may come across as sour faced. I have never told anyone this as I thought it was normal and everyone gets the same feelings but I'm thinking it's only a matter of time before I act my thoughts out.