Get yourself a really good chiropractor to start, who will mobilise you. In other words, get you moving by careful assessment of your situation followed by manipulation. This may take a few weeks but patience is a virtue in these circumstances.
The natural reaction to vast pain, as in your case, is to lock out as this is the least painful option. Sadly, this is a bad move as your muscles stiffen & lock, and the process spirals into immobility leading to more pain & discomfort.
Take the guidance of a chiropractor professional and get mobile, then while you are improving, analyse how the problem has occurred. Decide whether you need to alter lifestyle and avoid trigger factors. These may include such contentious issues as carrying those extra pounds/kilos that you resolved to lose in your New Year resolutions. Sorry to be blunt, but excess weight is not good for the spine and certainly not in an already weakened anatomy.
Lastly, the use of oral analgesics such as paracetamol does help. If only to give the opportunity for a little respite from the discomfort. Some advocate adding ibuprofen to this as an anti inflammatory, and short term use can be very useful in these circumstances. A professional may already be advising you of this.
Hope you feel better soon.