Do I really need to take another smear test?

I have taken regular smear tests since the age of 25 (all normal) and am now 51. I have been married to the same man for 27 years and we are both faithful. I have never taken the oral contraceptive for a long period and do not smoke. I am very wary of screening now as I went for my first routine mammogram last September and was diagnosed with DCIS which was treated by lumpectomy and radiotherapy. There are now various studies that state that women are going through unnecessary treatment for DCIS and apparently abnormal cervical cells. I had just started a new job which I subsequently lost. Now I am about to start a new job and keep receiving invitations for my smear test. I know it seems silly but I am finding it difficult to face this test and if it the benefits outweigh the risks then I would prefer not to have it.