I have 2 gouldian males how has became swollen on the lower stomach/vent. Its almost the size of a gouldian egg and i am really worried now!

I think one of them was a bit cold on his feet to! I dont know what to do! We have no birdvets here either.

I took some photos, it was not easy, but maybe better than nothing.
I am really worried and dont know where to start!
I have Ronex 12%, quick gel, iverlux, scatt, S76, 4 in 1 powder and worm away available at home..
Please help!
