After A Hip Replacement They Found I Had High Grade

After a hip replacement they found I had High Grade Non Hogekins Lymphoma. I then had 6 months R Chop Chemotherapy. I felt really well but at 82 years old I was not very mobile and live on my own. I have developed lymphodaema and my legs are a gross size.
IMy doctor prescribed water tablets, massage gel and suggested daily periods of raising my legs when lying flat.
I find massaging my legs in upward strokes quite difficult...is there a gadget...massager that I could buy to help me with this please?