Hello and welcome to HCM.
The problems you are facing ,
knee pain and twitching may be due to age related
osteoporosis due to
calcium deficiency .Twitching of muscle may also be caused due to stress or anxiety.
If I were your treating doctor,I recommend,
-Take tablet ibuprofen twice a day for couple of days along with cap omez once in morning.
-Calcium-
cholecalciferol supplement ,1 tablet in morning everyday.
-Warm compresses around knee if associated
stiffness present
-Balanced diet including more of spinach, dairy products,nuts like almonds,walnut,sesame,flax seeds for bone health.
-Exercise like brisk walking for 30 minutes everyday.
-if still pain persists,certain investigations like serum calcium level,,X ray knee,bone mineral density scan will be needed and further action taken accordingly.
Hope this information helps.
Thanks and regards.