pakistan visa in receipt of DLA

i hope everybody is in good health and that all people who have applied from pakistaan and elsewhere have been successful in their application process

i am now in pakistaan mirpur and got married to my lovely wife on 25/05/15 (may allah bless our marriage)
a little about myself

i am rin receipt of disabilty living allowance on higher rate care and lower rate mobility, i also get esa with sip premium, also child tax credit and child benefit full council tax exemption and full housing benefit. i have a 2 bedroom house which is rented from leicester city council. i have one child who lives with me who is also a british citizen, i am unable to work because i suffer from hearing voices and have odd with severe anxiety disorder

i have brought all the documents with me including my divorce certificates from my last marriage (as advised by batleykhan in his post about marriage in pakistaan

from what i know i don't need to meet the financial requirement and only need to meet adequate maintenance as advised by my mental health advocate

i would like to know how long will it take for my visa, as due to my illness i am very dependant on my wife in regards to my daily living

also i know that the visa fees are 956 how do i need for the nhs surcharge

i hope someone can give me some good advise.

i have read that those in receipt of disabilty living allowance are given priority in their application is this true ?
will