I took a shower in my separate shower stall and the water started filling up to my ankles. I heard the toilet gurgling and when I got out of the shower I noticed my garden tub had water in it. I looked in the toilet and it had lost water so I flushed it. The toilet started to rise as if to overflow but it didn't. The water subsided in about 15 minutes in all fixtures. A few hours later I was able to flush the toilet with no problem. Next day took a shower and it filled up again. This time I plunged the floor drain in the shower stall and it forced water into the tub. I plunged the tub drain and water was forced into the shower stall all the while the toilet is gurgling and losing water. There is also what looks like flat grey specks (maybe lime deposits I don't know) and skin oils in the tub and shower stall when I plunge it. Now it has been hours and the water has not subsided. I hope when I plunged it I didn't make it worse. What do I do? Thanks.