SQL Dynamic stored procedure issue

I am writing a stored procedure to be a dynamic sql. I am not finished but am having errors so far.

Below is my code and i am getting two errors. error with syntax near ',' and incorrect syntax near the keyword 'else'

USE [med]
GO
/****** Object:  StoredProcedure [dbo].[insertupdatedem]    Script Date: 04/11/2015 16:12:14 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[insertupdatedem]

@mrn int,
@lastname nvarchar(50) =null,
@firstname nvarchar(50)=null,
@address1 nvarchar(50)=null,
@city nvarchar(50)=null,
@state nvarchar(50)=null,
@dob datetime=null,
@ssn nvarchar(50)=null,
@marital nvarchar(50)=null,
@gender nvarchar(1)=null,
@zip nvarchar(50)=null,
@sqlquery nvarchar(500),
@sqlselect nvarchar(500)

as


begin

set nocount on


if exists(select 1 from med.dbo.demographics where lastname=@lastname and dob=@dob and ssn=@ssn)
set @sqlquery = 'update med.dbo.demographics set dob=' + @dob + ' ,ssn=' + @ssn + ',gender='+@gender+',marital='+@marital+',address1='+@address1+',city='+@city+',[state]='+,@state+',zip='+@zip
execute @sqlquery;

else

insert into med.dbo.demographics(mriid,dob,ssn,gender,marital,address1,city,[state],zip)
values(@mrn,@dob,@ssn,@gender,@marital,@address1,@city,@state,@zip)
insert into med.dbo.primarymrn(firstname,lastname)
values(@firstname, @lastname)

End

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