I was his caregiver for the last nine months of his life. He was an avid fisherman and long before he became ill he'd already been using the same solution he used on his fishing boat -- a plastic bowl (or bucket). Gross, I know, but that's what he did, and he was already used to using that instead of going all the way to the bathroom. It worked great. I just had to empty it. This doesn't work for other things though, so you might want to get a portable potty.
I also was the caregiver for my mother until she became immobile. I bought a portable potty for her room -- she needed assistance getting in and out, so I also had a monitor that sounded when she stepped out of bed. It works a treat.
You will be fine. It is pretty normal for all of us to need assistance sooner or later. Just remind yourself it is temporary and try to be patient. He's probably not thrilled either.
Edit to add: My son is a fire fighter. He told me if my mom ever fell to not wait and call 911. The firefighters provide emergency services as part of their job and are happy to come help. Just calmly explain someone has fallen and you need help getting them back up. That way they don't call for an ambulance and there is no cost. Don't ever try to lift him yourself (I'm assuming he's larger than you, but in any case, just don't try, it's really easy to hurt yourself).
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