If you entrusted your money to a broker who worked for Morgan Stanley you will need a lawyer with expertise in handling disputes between brokerage houses and their clients. Frequently, there is an arbitration provision in the agreement with the client and there are lawyers who specialize in this type of arbitration. Act quickly to protect your rights.
If he lost you millions of dollars, then you must have some money stashed somewhere else to hire an attorney to go after Morgan Stanley. After all, you have to have millions of dollars before you can lose it. I suggest contacting the largest firms in your state to see who they have on staff to help you.
There may be several potential causes of action that you have against Morgan Stanley depending on the particular facts of your case, but as Mr. Day states you need to act quickly in order to protect your rights. A more thorough consultation would be required to give you more specifics. Many attorneys offer free initial consultations. Take advantage of this fact. Best of Luck!