Anxiety after mammogram, ultrasound and biopsy

I am suffering from bad anxiety a month after clear results from my local breast clinic. I have a large lump in the upper outer quadrant of my right breast that I had investigated and everything came back clear. That was about a month ago so this week I did my first monthly self exam - I can now feel other (I think similar) lumps in my right breast and I am extremely anxious as I don't know if these were there before I had the tests or if they are new. I have had periods of health anxiety in the past and I am not sure if I am experiencing this again. I spoke to my GP who has referred me to counselling. He confirmed more than once that if I had the all clear from all these tests a month ago then I would not be feeling new lumps of this size that were anything to worry about now. My rational mind says I am ok but I just can't get past this anxiety. Has anyone else felt like this after getting the all clear?