How much weight can I lose in 2 months?

Hey all,

Long time lurker, first time poster. I stopped smoking in January and started a new medication around that time, and long story short I've put on around 2stone since.

I'm 26, f, 5'7" (170cm) and I currently weigh 13 stone (about 82.5kg / 180lbs) and I'm genuinely so miserable about it. This is the biggest I've ever been, my clothes don't fit right anymore (I seem to carry all my weight around my belly) and I really need help. I have a holiday coming up in November, and I'd really like to lose some weight before I go.

I have no idea where to start. I've swapped nearly all drinks for water (save my morning coffee) and I drink around 1.5L a day. I do about 6,000 steps, i work standing up all day and try eat as much fruit and veg as I can.

I guess my question is, does anyone have any advice for me? I'd really appreciate any help you guys can give.

Thanks in advance x