HiI'm 7.2 stone.My husband is 11 stone.We have a wood bed with wooden slats.Our mattress is medium firm.I've had a frozen shoulder for 2.5 years. It is finally in the 'thawing' out period.I am unable to sleep on my right side as a result. I thought a new mattress or mattress topper or both may help me.Can you advise which would be best from your range. I would dearly like a good nights sleep.