Had ceilings tested - artex contained Chrysotile asbestos. Having bathroom done and all ceilings skimmed to seal it in. The bathroom plumber knows and we discussed masks and damping diwn etc. Anyway he plastered over ceiling. Then today when I was upstairs with dd there was loads of dust and her has drilled through the plaster and into the artex to put in down lights and extractor fan. We were all coughing but I didn't realise that's what he was doing until tonight as I wasn't in the room with him. Freaked out that we have breathed in asbestos. Any advice out there?