Really worried about pains in legs

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I am mid 40s, always been healthy, very slim, reasonably fit. But I have recently, in the last two months or so, noticed that I occasionally get sudden sharp pains in my legs - calf or thigh area - not terribly painful but noticeable. Have also had cramps in my legs a few times.

Have been googling and have convinced myself that it’s MS or something similar.

Just make a GP appointment. You've had the symptoms for 2 months, so that's definitely long enough for them to take it seriously. It may well be nothing, but you'll feel better after getting it checked.

Have you read about restless leg syndrome? Seems more likely than MS from your description by best so see the GP anyway x

Ask for vitamin D check.

Mine were very achy and it was my ferritin that was low x