Glad to hear you are well on the way to recovery.
Just a word on the adjustable office chair...be sure to give it a good long trial 'sit' before purchasing and get them to thoroughly demonstrate all the adjustments...if you get a chair that doesn't 'fit' properly it will NOT be comfortable for very long.
You don't have to get an expensive one, but some of the cheapies are not comfy at all, even for 10-15 minutes. You should be able to get a good one for around $60-$100. Any cheaper and it may not be good quality...unless you happen to hit the right sale! I found one at a yard sale for $10 that was a perfect fit and it's still in good condition after several years of use.