My jaw and tooth are so sore after 2 novocains (procaine) and a crown put on 4 weeks ago. what should i do to alleviate the pain?

Go back: See your dentist. You should not be having pain after 4 weeks. The tooth may not be able to heal from the breakdown before the crown and then the crown treatment, and the nerve may be dying. This may be the source of your pain . If so, then a root canal treatment is indicated. It might just be that the bite is "high" and you need it adjusted. Let's hope for that.

Pulpitis: After four weeks, you are most likely to have an irreversible pulpitis. This means the tooth will need a root canal to fix the problem. If it had not been so long there would have been a better possibility of a reversible pulpitis. This is resolvable by taking away what ever is causing the inflammation, like adjusting the bite. The longer you wait, the more likely to need the root canal.

See an endodontist: Endodontists are dentists who specialize in saving teeth, and have at least 2-3 years of advanced training in root canals. They are experts at diagnosing and relieving tooth pain and use advanced equipment to treat patients efficiently and comfortably.