hey lampy.

there are therapies out there that work on these "knots" that appear in different muscles; massage, trigger point release, dry needling etc etc. they work in some cases, not in others.

i would be more interested in finding out why you are constantly having tight, knotted up hamstrings and calves.

have you ever had your back/lumbar spine fully investigated by a physio? i know that you have been referred so hopefully if you havent you will soon. your physio will be able to fully check out your back and see if there are any contributing factors towards you hamstring troubles.

the fact that you have trouble with hamstrings on both sides as well as saying you are troubled with back pain would lead me to think there is a connection. dysfunction in the area around your lumbar spine and hips can lead to increased activity and "tightness" in your hams. you could massage them every day but if the root of the problem isnt addressed you will still have this neural overactivity and tightness.

anyway, hopefully you will see your physio soon and get on the way to recovery. all the best.