if some orthopaedic doctor has  diagnosed tennis elbow for you then I will suggest you the following treatment 1st step is usually wearing a tennis elbow brace with pressure pad available from vissco company and physiotherapy you can try this for 2 weeks if getting relief continue physio for a month and to stop lifting any heavy weight with that hand  but if no relief then a steroid injection in the region of the pain can give you relief which is advisable to take only by a orthopaedic surgeon however there are other conditions around the elbow too so do get an xray done before any intervention the above are suggestions and follow then up with a consult of local orthopaedic surgeon