Bad throat now bad back!!

jenny jones 7

Hi all any help or advice? Did my first 10k 3 weeks ago and got really I'll after- had to stop training( I've entered for great north in sept) as I felt dreadful and had to take antibiotics.I'm in my third week of no training and( in a huge attempt to get well again) and now my lower back is agony.I'm on my feet alot in my job and think it's from driving alot( 3 hrs a day in the seat). I'm feeling really low as running helps me battle my depression, and I was looking forward to continuing my training in preparation for the half marathon. I've had my bad back before( it's my sciatic nerve) but don't know what to do now for the best and am truly fed up. ??sorry for sounding do desperate!