I sure have had those symptoms.

When I was 5, I was hospitalized for 3 weeks due to walking pneumonia. My butt was a pin cushion 5 x a day (which is the cause (I believe) for my severe fear of needles today).
It wasn't until about 12 years ago that I began to contract reoccurring pneumonia once a year....almost like clockwork. Had I known that the house I moved into had mold growing within the walls (unable to see on the inside underneath the paint), I more than likely would never had fallen ill again.
I lived in that house (a rental) for almost 7 years without repaint, until the landloard wanted to sell it and we had to move. It wasn't until our moving out that we discovered the mold, due to his crew coming in to repaint and discovering the mold. It's no wonder I kept gettin sick.
That continuous exposure only triggered what seemed to be a weakening of resistance within my lungs and now if I'm not extremely careful, a common cold caught goes straight to my lungs and pnemonia will soon follow.
I don't know if that's how pneumonia works, but I do know that I will fall ill to it if I don't use extra precautions around airbourne viruses.

The pain? Absolutely intolerable! It felt like someone had a crowbar between my ribs attempting to seperate them. When I was first diagnosed with pneumonia (while in that house of mold), the doctor told me that had I gone in a day later, both lungs would have been almost completely filled and a week's hospitalization would have been required. I only had to stay for one day and overnight that time for the treatment of antibiotic through I.V. (UGH...more needles). Laying down only felt like drowning, so I was forced to sleep sitting upward until the majority of the infection was gone.
It was horrible.
Never inhale mold of any kind (if you can help it...lol)..It can and will (if exposed to it long enough), infect the lungs.

Glad to hear that you're getting treated for it before it had turned into pneumonia. The effects of the medicine does take a few days to show improvement. Have a little patience. However, you may want to check into why you're having issues with ur throat. Maybe a reaction to the medication.
For me, with each case of reoccurring pneumonia I contracted, I was issued a stronger anitibiotic..until last year I was on the strongest available to date..others simply didn't work anymore. If you don't show signs of improvement within at most, 3 days, then return for a stronger antibiotic.

Take care!
Shangrala