Waiting for colonoscopy!

Hi there! I am struggling with anxiety/ worry. I am 49. I haven't felt right for 7 months. Initially I had a lump which was sore appear in my arm pit before Xmas. I was referred for a boob scan etc. by the time I had this is had gone down. They said it was my lymph nodes but all looked fine. Since then it is up and down all the time, sometimes really sore. I had also been struggling with change in bowel habits and feeling , aching in my coccyx area. I have been back and forwards to the doctors, they have said piles / fissure. Finally I have been referred, I had blood fbc test and all was ok apart from my lymphcytes score was low. I am seeing a consultant on Monday with a view to have a colonoscopy! I am so scared as I know something isn't right. Separate to this I have a hereditary heart condition that I deal with and take meds for. Life has been so hard over the last year trying to be heard and listened too. It's so hard to stay positive. I am terrified. I am a mum to a 15 year old daughter