I have a big cavity in one of my molars which i have been trying to ignore for so long. I hate going to the dentist, it really freaks me out and gives me panic attacks plus the cost is horrendous without PHI, but i am worried if i dont go soon i'll have to loose another tooth which is so much worse.

Is it ok to have a cavity filled while pregnant? And can i use the 'happy gas'? I can't go without using it. Are there any risks i should be aware of?