I bashed my elbow on a shelf back in January which has developed into tennis elbow. It's so painful and I have tried a bandage and various elbow supports without any comfort, I found a good one recently but I think I might have an alergy to the material.
I suddenly had an idea this morning to convert a cotton and lycra sock which is a bit too tight. I cut the toes off and it has worked a treat, my elbow fits into the heel and it hasn't cut off the circulation above the elbow. I can recommend trying it if you ever have the problem.
When my arm and elbow packed up last spring, I bought some stretch support bandage from Boots and cut off the appropriate length. It did help to support the elbow without any discomfort and reduce the swelling. They sell them in different sizes so you need to make sure you have the correct width for your arm. Hope your homemade dressing gives you some relief Frazz,