Urinary incontinence during periods only

I suffer from urinary incontinence during periods for 3 days during which I don't feel any urinary pressure at all. Urine flows till the time the bladder is empty and I have to wear diapers for it. Can't do any work or move out of house due to this. Consulted a gynaecologist, Urologist and also got CT scan done for checking fissure/fistula but the reports were negative. Nothing unusual was there in the full abdomen ultrasound as well. The female hormonal assay tests also normal. On other days I function normally this problem exists only during periods rest days are all normal. What to do now? Whom to show as every doctor says its a first of its kind case for them. I am suffering from this problem since past 8.5 years starting May 2013. Its affecting my work and everything. Please help me. I have spent lot of time and money on this since the year 2016 visited several gynaecologists, Urologist and went through numerous expensive tests also. Adult diapers also cost a lot. I can't bear it.