nikkah and mental disabilities?

Nikah, literally: contract is the first, and most common form of marriage for Muslims; described in the Qur'an in 4:4.

A Muslim bride signing the nikkah nama or marriage certificate.Regulations:

It is aimed to be permanent, but can be terminated by husband engaging in the Talaq (divorce) process or the wife seeking a divorce.

The couple inherit from each other.

A legal contract is signed when entering the marriage.

The husband must pay for the wife's expenses.

If a divorce date is determined in the Nikah contract:

In Sunni jurisprudence, the contract is voided.

In Shia jurisprudence, the contract is transformed into a Nikah Mut'ah.

Requirement of witnesses:

Sunni: Two

Shia: None

Primary Requirements

1) Mutual agreement (Ijab-O-Qubul) by the bride and the groom

2) Two adult and sane witnesses

3) Mahr (marriage-gift) to be paid by the groom to the bride either immediately (muajjal) or deferred (muakhkhar), or a combination of both

Secondary Requirements

1) Legal guardian (wakeel) representing the bride

2) Written marriage contract ("Aqd-Nikah) signed by the bride and the groom and witnesses by two adult and sane witnesses

3) Qadi (State appointed Muslim judge) or Ma'zoon (a responsible person officiating the marriage ceremony)

4) Khutba-tun-Nikah to solemnize the marriage

if u had two witness present at the nikkah, ur nikkah is valid as far as i know.however u may consult any imam for further clarification !

for hafith on nikkah u may see

http://www.usc.edu/schools/college/crcc/engagement...

God Bless U

Why don't you call up the nearest Imam or cleric and ask them? It seems to be a fairly important matter, so you'd want the final say of authority on it wouldn't you?