Physiotherapy after the subsidence of pain, for strengthening of knee joint muscles would give you some relief. As ACL is just sprained, no need of reconstructive surgeries.
Next Steps
Expose yourself to morning sunlight, take a walk during early hours of morning. Inj ARACHITOL 6lakh IU once a month for 3 months will be beneficial. Get physiotherapy for knee joints, if you are obese, concentrate on reducing the weight.