i don't feel like myself

 My son is 3 months old. My emotions have been very intense and they change on a dime with very little trigger. I get very mad very easily which is always followed by being really sad. I feel bi polar in a very short period of time I can go through multiple emotions all very extreme from screaming to crying to laughing. I feel awful for my bf I have been very mean to him but I keep trying to explain and I always apologize. I have been really trying to keep myself in check lately but it's so hard. I can keep it under control when I'm at work but I'm awful at home and have had a few melt downs while with family. I know I'm driving my bf crazy with my bitch fits and crying fests and clingyness I feel legit crazy. This isn't constant but I seem to have several "episodes" a day. Does it get better? I have not mentioned it to my doctor since i have never felt like hurting my son or myself. Any advice?