You need to consult a rheumatologist, if not yet done and following investigations would be advised;
1) Complete blood count,
2) Erythrocyte sedimentation rate,
3) Thyroid function tests,
4) Muscle enzymes;
5) Anti-nuclear antibodies (ANA)
6) Adrenal function test
9) Anti-SSA (Ro) or Anti-SSB (La)
10) Coombs test
12) MRI of elbow
This is likely to be some immunological arthritis. Meanwhile following may be helpful;
1) Anti-inflammatory analgesics like Motrin / Advil for around 10-14 days.
2) Elbow brace
3) Physical therapy
4) Warm compresses
5) Local analgesic patch / ointment / spray
6) iontophoresis, phonophoresis
7) electrical stimulation
8) shock wave therapy
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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