Bipolar disorder checking myself out

I was ina relationship for 4 years and the last year was hell. My ex and I have a 2 year old together. But he always tells me I'm bipolar. But he would call me unpleasant names and such like we got into an argument and he was like ohh did u get ur bipolar disorder checked out dumb hoe and so on. I feel this ruined our relationship. He also said sometimes he just didnt know what mood I'll be in. Told me I was a hard person to love and left me for another. I know when I was younger I was diagnosed with ADHD but after 15 I stopped taking it. And was fine I'm 22 now. My father died when I was 17 and I always felt like I changed who I was. Like something triggered in me.

Two years later im talking to someone new. Ive known him since I was 17 so a couple of years and he says I change moods really fast and sometimes he doesnt know how to approach me.he told me I was different back then always happy and outgoing I got really disappointed and told him we need space. I feel really hurt about this. He Says its like I have 2 split personalities. Uses bipolar as an example.

I have a best friend I've known for 3 years and she tells me that I change moods , i get real hyper and start talking about new stuff then when I'm depressed I cut everyone off and dont want to be bothered says I'm bipolar also. But shes sweet about it and says she will even come with me.

When I know I'm in a shitty mood I stay clear from everyone. Because I can get rude. I live with my mom 2 sisters and they all say I have issues. My mom been telling me I changed and i was never like this to go get checked out or talk to someone.

I know I change moods. I dont try to. I try to stay happy and positive. I would for a long time. Then idk I feel depressed then irritated start crying then I'm from sqaure one. But when I reread thru messages with my babys father it's like I question myself like what's wrong with me and I apologize.

Sometimes I feel like I failed as a mother because I couldn't give him a family with his dad. I never yell at my son or spank him. I do a great job as a mother.

The new guy said I should go see a doctor. He says sometimes I say crazy off the wall things or my mood swings are bad.

In college I can never stay focused enough to even finish

Any opinions? I'm really disappointed at myself? Idk what to do? Mental illness? any one knows someone who has bipolar or so themselves? bipolar while a nurse? Tips?Advice?