Can Spider Bite Causes Sore Breast And Swollen Armpit?

Seems silly now really, 4 years ago I got bitten by something (possibly a spider) in the garden which caused my left hand to swell up with a lot of pain and had to keep it raised for a while. I was living in the USA at the time. Within 1 week my left armpit (around my lymph nodes) started to swell and become tender and sore. I had an ultrasound and everything looked normal. Every month I started to get the cyclical swelling and breast tenderness. I moved back to the UK 3 years (very concious of the NHS failings regarding cancer diagnosis) and in Feb of this year I had a hysterectomy (ovaries intact) and the sweeling has had no rhyme or reason, didn't seem to be following a pattern. Today, my armpit was visibly swollen and quite large and I went to a walk-in clininc and they want me to go to have an ultra-sound again. They said both my breasts were quite lumpy with the left a little more so. I got home and suddenly burst into tears and it dawned on me that maybe it is just my hormones and I am still cycling after the hysterectomy. I also remembered that my breast felt heavy last night after I took my bra off. Maybe I have been cycling all along but didn't notice the pattern because of the lack of periods. Today has been the first day I have been quite emotional for no reason other than fear of cancer since the hysterectomy so I am now adding up the symptoms and am realising that it is probably just hormones causing the underarm left pit to swell so much. It just seems weird to have had a bite and then this reaction started. Is it a coincidence or are they related. Has my body been fighting an infection for 4 years in a cyclical manner or it is just hormones. Is it cancer or am I being overly paranoid. Is is a good idea to have the ultra sound anyway.