So I've had my budgie couple for 6sh months and recently i started covering 3 sides of the cage to keep them warm during the winter, i guess they got comfortable because they started mating, my female budgie laid down 4 eggs before she got sick the first time, she was so weak she couldn't walk or fly as if she was dying, even when i held her she didn't resist and try to bite me and we were so scared, hopefully we let her sleep and the next day she was somewhat better and i bought her calcium and medicine to put in her water and she was fine again, but i noticed these couple of last days they were mating alot, multiple times a day and she now has laid 6 eggs (1 broke so she has 5 rn) and today i saw them mating 2 or 3 times and that's only what i saw but now she's weak again and can't do anything i felt like she was dying when i held her, and when i put her in her wooden egg box the male kept going in to her and i could hear voices like he was mating her although she can't even open her eyes, i now separated them and i think she's asleep, why does she keep getting sick and what do i do?