If this is a chapter 7 bankruptcy the process is relatively easy. You will need to find the forms of your state and file them with the clerks office.
There may be free legal clinic in your area that will assist you in filling out the bankruptcy forms.
However, keep in mind that you will be charged a fee to reopen your bankruptcy. The fee varies by State. Look at the Bankruptcy Court website for additional fee information.
Your suit against the company is an assett. Can you exempt it under your exemptions? If not the Trustee has the right to proceed. If you do not get your schedules amended to disclose, the company your are suing could use that fact as a defense against you.
You will be estopped from the claim if you did not list it in the bankruptcy, because of judical estoppel.
If case closed file motion to repoen along with amended schedules B and C.
The bankruptcy court filing fees are going up on Tuesday from $260. Fon't know what the new fee will be. I am not aware that there is any difference in the amount of filing fees throughout the US. Forms to reopen are on the court's website.
Hope this perspective helps!
If you don't have the money to reopen the case, you might talk about this to the personal injury attorney you hire, and see if he'll fund it. But the real cost to have an attorney do this is probably going to be less than $1k.
I'm not your attorney; my answer to your question includes assumptions. If you want me to be your attorney, I'm easy to find.