Unless you can face getting to the shops and buying something to sort yourself out there's not much you can do apart from live in the shower for the next week. Using tissue paper or anything like that is a million times worse than pads, trust me. Do you have self-service checkout machines where you live? They're a god-send to me, just grab the damned things, tuck them under my arm, scan them and throw the straight in a bag and pay, no need to talk to anyone else, or for them to even notice what you're carrying. You'd probably just look like an awkward guy buying for his girlfriend/daughter anyway.
Check your bathroom cupboards, even if your mother's been through menopause/on the pill/whatever she might have some still laying around from when she did need them or from your pre-T days. It's worth a look, it's amazing what you can find at the back of bathroom cabinets.
To try and cope a bit better wear two pairs of your tightest underwear, and preferably a pad or something. I find it helps because you can't feel it leak/smell it (maybe it's just me who can smell it, I dunno.)