Suggest Treatment For Tennis Elbow

I developed tennis elbow in early January. Rested for 6 weeks and took Advil 800mg 3 times a day. No improvement. Dr gave me steroid injection w ultrasound guidance. Had some improvement for a coupe of weeks then back to same pain and weakness. I just started meloxicam and restarting using voltaran gel. Should I consider the whole blood injections now or give it more time, or other. Please advise. Thanks!