H.F.
My parents have 5 children, 4 sons in law, 1 daughter in law, 15 grandchildren, and 3 great grandchildren.... whoa that sounds like a lot for only being 60. My dad also has bipolar. As far as I am concerned you do whatever life throws at you. Yes it was hard for my siblings and I when my dad had his episodes. But every family has their problems and now all of my siblings and I have turned out great. This morning my mom actually told me that she wishes she had had one more.
We never had money for vacations. Somehow my parents found money for my sister and I to take dance. While other kids got a new wardrobe at the start of every new year I got a pair of hand me down shoes and maybe one outfit. When I was a kid I know I complained a lot. It sucked for me then. Now that I'm older I would rather have those hand me down shoes than not have my sister who always showed me how much she loved me. Or my brother who scared the crud out of the bullies at my school. Or my other sister who worked hard and earned money to buy her own nice clothes and then shared them with me.
Whether or not you should have another child is between you, your husband, and God. Just know that Disneyland and designer jeans don't equal happiness. They are cool sure, but in the long run they don't matter much at all.