2ww breast referral wait and symptoms

Hi, 

I'm 38 and two weeks ago found a palpable hard lump in my left breast. Really quite scared. Waiting on clinic appt. I've had a letter saying if I've not heard by last Friday then to call, but when I call they say you 'you'll hear with an appt in the next 7-14 days'. 
 

Any ideas how long the process actually takes? 
 

Also wanted to ask about other symptoms? I've been having night sweats - not drenching or every night, but enough to wake me up a couple of times a week. And feeling nauseous, but wonder if that's the anxiety? 
Anyone else had similar symptoms pre diagnosis? 
 

thanks x