Dear Linda, as a Physiotherapist I would request you for a life-style modification along with Physiotherapy/Physical Therapy
.I suggest you to take rest for some days with Ultrasound
Therapy (Pulsed mode, 1:1, 10 mints for 15 days), I.F.T(4 Polar vector/scan mode for 20 mints for 15 days).Try Static back exercises & Core stabilization exercises after pain subsides.I think you have to leave playing golf & trekking for some time as these can injure your back further.Please follow these & give me your precious feedback.
with love & respect,
Kaushik Guha, B.P.T, M.P.T