'Older' bride to be, hello!!

Hi all I've just joined so finding my way around. I'm in my mid 40's and am marrying the love of my life in September. Since meeting him I have slowly gained 1.5 stone and I am desperate to lose it in time for the wedding. Not least because I've bought my dress, and it doesn't do up!!! It sounds a 'doable' target but I've been dieting for 7 weeks now and really struggling to lose weight - although I know how to as before I met him I lost 5 stone, all by myself and easily so I am kicking myself for allowing the gain! I can't exercise much or at all some times! Anyway I hope I find help and inspiration on here!