Can't comment on heart and breathing rate -- how fast is fast? Has it a high temperature? It ought to have settled down by now -- if in any doubt, don't waste time talking to us and take it to the vet.
I suspect the "things" in the groin are the kind which are definitely out of place on girl bunnies... Could he be a buck? The testes are normally soft lumps in little fur bags, which become more obvious as the rabbit matures (in babies the bags are almost empty and quite easy to miss).
The testes can become swollen sometimes. Myxamatosis does this - they get huge and hot and the poor bunny practically has to wheel them about in a barrow. Another reason to check with the vet sharpish -- myxie needs early treatment.
Do you have just the one doe? If not, you may find you have lots more little ones quite soon...