Help... Anxiety overload... Or genuine concern?

[gemsparkle84]

I'm 30 years old and 7 weeks pregnant with my first baby which I am ecstatic about. Hubby and I have been together for 8 years and married for 1, it is a much wanted pregnancy. I have a long history of anxiety and OCD, peaking in 2011, being under some sort of control since then. For the past 9 months I have had chronic pelvic/ lower back pain right into my bottom and the tops of my legs leaving me often with buttock numbness and sciatica symptoms. For the past 3 months I have also developed a chronic dry cough. Because of my history of anxiety (I am excellent at catastrophising) I assume that I have cancer in the area of the pain and this has spread to my lungs, causing the cough. I also have a small lump on the back of my head which occasionally throbs. I have been to the Drs many many times, I have had pelvic X-ray/ pelvic ultrasound, chest X-ray, all coming back normal. I had a blood test (before I conceived) which came back normal apart from my ESR was raised, suggesting some inflammation somewhere in my body. I have to return for another set of bloods tomorrow. I have had so many reassurances from Drs that I do not have cancer but I just cannot shake the feeling, which is terrible when I am trying to look forward into my pregnancy. I should add that my Mum passed away last year after a battle with breast cancer. After diagnosis many years ago and being clear for years she wasn't diagnosed as it having spread (to her bones, lungs and liver) for months and months even after she visited her GP. I feel as though this is happening again. I want so badly to get on with my life but I'm just so anxious and my entire life is consumed by these thoughts. Please help me.