Poor you. You will need to perhaps exercise more patience as it can take a few months for a flare-up such as this to completely resolve.
As Merlot says here, patience is important. It will heal, undoubtedly. You say that it starts to get better and then relapses again. I wonder if that is because you are trying too hard to resume your normal routine. You say you live alone, so probably don't have anyone around when you need it to deal with any heavier lifting or twisting etc., which you may be trying to do yourself. You must stop this ! Even making the bed and tucking in bedclothes would be enough to aggravate the injury, along with bending, sitting too long, driving, walking on uneven ground. Injured backs are a really difficult thing to manage, but if you don't look after yourself, do your exercises and maybe visit an Osteopath for some gentle manipulation and advice, you will not helping yourself as you should.
Incidentally, you need a well recommended Osteopath with healing hands, not someone who shows off by 'clicking' and 'cracking' your joints. Avoid those at all costs.
If your Doctor has prescribed anti-inflammatories, maybe only take them to be sure of a good night's sleep. My Osteopath has always said that taking them routinely, which might go some way to relieving pain, is a sure way to becoming addicted and needing a stronger dose - as well as encouraging us to carry on as normal because the pain isn't so bad! So, painkillers only when you are definitely going to rest - not to get you through doing your usual chores!
You're not old and you will be active again if you're kind to yourself now. Stay positive and good luck!