Negative test results for Lyme do not mean you don't have it. The tests are not accurate enough for that.
There can be long-term effects after the Lyme is gone, but also the Lyme may still be there - it is not as easy to get rid of as most MD's think...
Vitamin D seems helpful for some with pain - glad you are on the fish oil (look at the label to find out how much Vitamin D it contains). It may take a few weeks before you notice a difference.
Suggest you look into finding a Lyme-Literate MD (LLMD) or Naturopath (LLND) to consult with about treatment options for your current symptoms. If you make a new topic post here with the name of your town and asking for LLMD's there, it is likely someone will respond with suggestions.
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, intermittant pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Domperidone, Colloidal Silver (used topically), probiotics, homeopathy.