Hi Phil.
Welcome to the forum. I'm sorry that you're struggling, mate.
Recoveries vary enormously. Hopefully, things will gradually improve. As you said, regards weeing, apparently most blokes are back to normal between 6 and 12 months. Exercise is good but don't overdo it.
Losing penis size is common and blokes often do have to sit down on the toilet to pee. Mine was as small and sprayed worse than a car windscreen washer.
It's very early days for you mate. They say using pumps is good for your penile health, I couldn't be ars*d with all that palaver, though.
I'm over two years post op now. I had full bladder control after about 7 months. I still cannot get natural erections, but penile injections manage to raise the living dead. Not to its former glory, but good enough to do the biz. I'd say I'm an inch or so shorter than pre op but that's a small price to pay for being cancer free.
Good luck mate. Please keep us updated. You will get loads of support here.👍