Why do I feel so unwell? - I'm 16 days post surgery and everything is so sore and painful. I don't think I'll be able to cope with any more treatment

I am 16 days post surgery right side lumpectomy, mammoplasty and lymph node removal.  

This is my second time around 14 years ago left side mastectomy, implant and right side reduction.

I thought this time around it would be a walk in the park - how wrong I was.  I feel so sore and uncomfortable.  I'm taking pain meds that don't seem to touch the tenderness or pain.

I'm also trying to deal with a tear to my knee which has just heightened things as it's wrecked my mobility and ease of getting around.

I'm in tears most of the time and feel like such a wimp.

Seeing my consultant tomorrow for my results and just don't think I will cope with treatment.   Trying so hard to lift myself out of these emotions but am struggling.

I see such brave people on these sites and  feel so inadequate.