don't really know what to do. I went to my doctor to investigate a swelling after my second COVID jab. The swelling occurred under my arm and around the injection. I read up and realised with the jab I had it was a side effect. But I went to the doctors anyway after being told by 111 to if it didn't start to go down. 
I wasn't expecting what happened to happen. The doctor examined me and told me yes the swelling was a side effect. He asked to check my boobs whilst I was there and asked if I check them regularly. Which I said yes but wasn't sure if o was doing it right. He checked both and said he could feel something in my left breast the side where the swelling was. He put my fingers to the place but I couldn't feel anything. My mum and my dad and my grandad on my mums side all had cancer. My mum is coming out of breast cancer and is in remission which honestly I have no words for how happy I am. As she was diagnosed with breast cancer in 2018 and was cleared in 2019 after a awful year of treatment. 
The doctor said due to my family history to refer me to a breast clinic for a ultrasound. I'm due to go in a few days but I can't sleep and I am struggling with fear and worry. I don't know what I expect you to do or say. But I'm feeling my breasts and some days I feel like I can't feel anything the next I do. I honestly don't know what to do. My mind is going into overdrive and im now wondering if other pain or things recently could be cancer. I'm thinking so irrational and I know I am but I can't help it. I'm even convincing myself in my gut it's serious. 
sorry as I know everyone is going through this or something like this on here and you all have your own problems. I'm just petrified. I'm trying to hold it together with my partner and family and act strong but im so scared. I'm 35 and I saw what my mum had to go though i feel selfish for being so scared and praying that it's nothing serious.