Mrsmogan being scared is normal IME, also being tearful is as well you may well feel really tired as well. Your body is fighting an infection.
I have had them exactly the same as you where they literally run from front to back, these normally have a few heads on them.
what you have to remeber is the severity of mine, but yes i have had several drainages and actual operatiions for mine. i get them everywhere not just in the armpits or groin i get them on my legs, back,ear lobes, etc. I don't want to scare you even more so it not really fair of me to compare mine and yours.
A little tip if you can go pant free for as much as possible, don't wear any lace or scalloped edges either until it has completely gone. Listen to what your body is telling you, if you are tired then sleep, if you are in pain take painkillers and maybe a soak in the bath, eat whatever you r body is telling you you need etc.
Any other help i can give you just let me know, even if you just need a chat, i am in and out today but i will reply to asap.