Hi Dal21
Afaik, it's only really, really, really ultra strenuous exercise you need to avoid, something about lactic acid I think. And by ultra strenuous I mean you can't go on twenty four mile top speed marathons and the like.
You can have a drink... you can have a couple of glasses of wine in the evening. If you drink just after you've fed ds that's even better as by the time you do the next feed, the majority of alcohol will have left your blood stream.
One thing that helped me, and I started at about six months (would have started earlier if I'd known how well it would work), was giving ds his own bed time and (something approaching a) bedtime routine. I would feed him, switch feeding (one side 'til sleepy, other side 'til sleepy, back to first side 'til sleepy, other side 'til sleepy and so on until he just wasn't sucking at all) to make sure he was really full... then I would read him a story, then cuddle him to sleep.
The first few nights he did cry as he was used to being fed to sleep. But he was crying while I was holding him, so I didn't feel I was neglecting him.
After a few nights he was then used to being cuddled to sleep. And I'm not sure why, but he now sleeps a lot longer in the evenings.
This gives me and dh valuable time together but also, if I am really tired, gives me the option of an early night as I get a couple of hours' extra sleep.
I also have ds in the bed with me after his first waking, so sleep through most of his feeds, well, barely wake anyway.
(Obviously be careful with this if you are having a couple of glasses of wine and it's making you drowsy, and don't do it if you smoke.)
HTH. And congrats on getting this far... it doesn't necessarily get easier but it does get much more fun (especially when they can "ask" for it by tapping your chest, or when they play with your nose whilst feeding... hilarious!)