Over 3 1/2 years. Left side & this year right side kicked in. Worthless ent. Tried magnesium & lipo flavinoid - results torn up stomach for 12 months. Gastro dr & family dr never heard of the lipo stuff but said get off it. Current cycle 4 to 5 days on with excruciating loud all but 1 of those days. Currently starts Sunday night & stops thur afternoon. Have 1 day completely peaceful & the other couple faint noise. 3 different noises @ once. Suicide sounds better & better these days.