Over 40 and stuck

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morning ... I'm really struggling to be honest I can't seem to lose weight no matter what I do .. Slimming world saw me lose 4lb then nothing a couple of years ago this worked bit ive now gone up 2 stone I was wondering if anyone can help maybe it's my age and I'm not going to be able to .. I've got 4 months to lose 2 stone I am so depressed I go on holiday and can't go looking like this .. Please has anyone got advise I work shifts so struggle with how to eat on nights .. Anyone in the same boat or can offer help I can't afford the gym either nor do I really have time to go thank you in advance xx