I'm 42 Years Old And Have 3 CHILDREN One 23,15

I'm 42 years old and have 3 CHILDREN one 23,15 and 8 ,my milk obviously came in when I was 18 with my first child but I have had it ever since even to the point were it squirts out when I make it,I suffer from my nerves and when I am due on for my period my joints get very weak and this is when I injure myself like I could bend down or even turn around and my back can go but it's always at its worst when I'm due on and on,as soon as I finish my period it's a lot better,also my nerves can really play up more so when I'm due on,my moods change too which I no is quite common,it's all getting me really down,I've been to the doctors but they just say it must be normal for my body,I can't do the pill as this makes my nerves bad,I feel I am at a loss with not knowing what to do,any suggestions please x