Former EMT who developed lateral epicondylitis from baysitting!
The cure is REST until it is better, and you won't get that lifting litters. It will tend to reoccur. Talk to your doctor, then make a decison.
There are more than one conditions which all are called "tennis elbow"; they can include bursitis, epicondylitis, tendonitis, insult or entrapment of the nerves near the elbow (usually distal, not always), arthritis, chip fractures, even ligament damage or early cancer. See you doctor, figuer out what it takes for you to get and stay well, then go from there; after almost three months self-limited lifting, I still have trouble and three hours watching my granddaughter cost me about half of the following day with discomfort.