Being down to 5 mg after only 3 months must be something of a record. It's good if you can do it, but PMR usually lasts much longer, so tapering so quickly can easily lead to a flare-up of symptoms. Have you had regular blood tests to check CRP, ESR levels etc. I take lots of fresh turmeric and other low inflammatories like blue berries, olive oil, hemp seed oil, etc; I was on a low inflammatory all natural diet for 3 years prior to PMR hitting and it didn't help prevent it in any way. But it has certainly helped in limiting side-effects from the steroids, but not in reducing the amount of steroids my level of PMR needs. It's still quite high after 18 months. I can get the steroids down to 10 mg and keep the CRP normal, but dropping under 10 mg and CRP shoots back up again along with more pain.