Rigging help

It sure where to ask .. so I found this site and wonder if anyone would be able to help.

I can’t ride my spouse anymore due to physical disability but have been trying different ways to make it work . I have found that having a strap hooked to the bed frame and wrapped around me to help hold me , while allowing me to use my arms pulling on the strap , was actually the best option thus far . However I almost broke the bed frame . I am 250lbs & most of my weight is leaning back as I do not have the ability to hold myself upright.

I want to know , what bolts could I use to assist ?( rather than the bed frame ) I am thinking I could have bolts installed into my wall framing , just above the bed frame , and could ran the straps through the belts then around behind me . But I have no idea what bolts would be best due to the movement, weight and angle Of pull forward . Any help , or suggestions where to get help , would be appreciated