Swollen Lymph Node

I'm 27, I'd say I'm not too healthy but I'm not unhealthy. 
So.... a few years ago I felt a swollen lymph node in my groin on the left side. I'd lost a couple of stone and the doctor said in smaller individuals you can feel them. So I didn't think anything of it. But it is still there. 

June 2019, I had an accident on a ride at the fair. Since then I've had nothing but issues with my lymph nodes. One floats around my collar bone when I lift my arm up, I had an ultrasound on my neck and collarbone, they informed me there was nothing sinister. Which was a relief. 

I had had FBC done and they found no infection and no issues. 

At the start of January 2020, I went to the doctors again as I had a hard lump on my neck. The doctor felt it, he did mention lymphoma but he gave me antibiotics for it. I'd finished the course and it seemed to have gone down. But it's still there, smaller, but still hard and rather tender to touch. My neck gets stiff and turning my head to the right is becoming very uncomfortable. 

I feel as if they aren't taking me seriously and I've got a routine appointment at the beginning of February as I had a FBC recently and the doctor would like to see me. 
I'm really beginning to worry about it, I know it's not right and I just want to know what's going on. 
I've got a 2 year old beautiful daughter and this whole situation is really scaring me. 

I just want to know if anyone else has experienced this and if anyone had any advice on what I can say to the doctor to maybe be taken more seriously. 

Thank you. 

Em.