Hi and welcome to JA. I am Ray and will be the expert helping you today.
This is considered a material breach of the sales contract based on non disclosure.
You will need a lawyer here locally to send demand letters to all the parties involved and seek to hold all of them liable.This includes seller, inspector, and realtor.
I would disagree that the inspector has no liability to report anything seen and observed here in Virginia.
You would see of you get offers of settlement here from the parties from the demand letters.The real estate
agent and the inspector usually have errors and omission coverage and the seller may have had home owners coverage again as a potential source of funds.
Your lawyer would likely use a forensic accountant or other expert to project your damages
.This might include your inconvenience, damage to health, etc in additional to costs of remediation and legal fees and costs.
Once you are able to receive offers then you decide if you want to sue the remaining parties here.I very much think you will get some partial offers of settlement off the demand letters.
You want a real estate litigation lawyer, you can locate one here.
I appreciate the chance to help you today.Sorry you are having to deal with all of this.If you have more follow up please just ask.Thanks again.