Strange obsessions

So although I haven't been diagnosed with anything yet, and many of my problems probably reduce to anxiety, I have some pretty unusual obsessive behaviour which I can't find anyone talking about and it's been affecting my health quite badly by this point so I'm going to put it here.

I know I have several things I will do obsessively to comfort myself, including picking my lips which I usually stop before they start bleeding but not always, picking my nails especially toe nails which have definitely been damaged as a result(times I was convinced they were becoming ingrown and was trying to cut at the insides with scissors but didn't quite destroy them), and picking the skin on my feet is a big one-I feel they're hideous because I've had so many blisters in the past(high instep means I wore lots of shoes which never quite fit) and the skin on them is permanently hard but I will sometimes spend hours picking at a new blister or some of the dead looking skin, again sometimes with scissors. The moment I get a blister I can't stop thinking about it and at least the next day, but quite possibly the same day, I will spend ages picking at the edges. I only ever wear high heels or shoes which are at all open for concerts and even then I panic about finding tights so I don't have to show my feet. I also might spend hours trying to pop a spot if it's on my nose or something-can't ever ignore it, probably why I have so many of them.

Those things come and go, but what I started doing that I can never avoid is controlling my spending when food shopping. I will often not buy something in one shop if I know I can get it cheaper at another, and I spend ages to decide whether I need something or not. If I can't tell if they're better value just by looking I will hunt down the quantity and do a comparison based on unit value. It's ridiculous and I don't have a reason for it anymore either as my dad inherited money so now keeps telling me I don't need to worry about money, but I literally CAN'T STOP! And it leads to buying random stuff that might be useful only to get the point of cooking and realise I don't want to. I've become isolated and generally don't like to spend time in the kitchen preparing food so just find stuff I can take straight back to my room. Because I usually don't buy enough of that food I end up not eating enough but I eventually buy snacks only to eat them in one go(kind of a binge but without regretting the eating, just the spending) and make myself sick as a result(today it completely messed me up). Whenever I buy snacks though I cave and eat them all soon after so that's a separate thing, but the main thing is the food shopping. And also best before dates. I usually can't make myself eat something that's past the best before, and if it gets close or if it's food that's been unwrapped and which I have to put in the fridge which I don't trust then I will probably end up chucking it away. I feel guilty about that because I know it's a waste but I probably chuck about half the fruit, veg, bread and dairy I buy away before I've eaten more than half of it. With bread, tinned tomatoes and mushrooms that have been started, I will constantly inspect for mould and sometimes with food I think I delude myself into thinking I saw something wrong, at which point it goes straight in the bin. Again I can't stop.

Anyway, what do others think is to some degree normal, what might be anxiety and what is just plain strange? I'd really like to hear others' opinions. Most of these things I do kind of unconsciously and can go into a bit of a trance with, except the best before dates which generate a kind of fight or flight panic response. Also would be nice to hear experiences from anyone who sympathises because I feel so weird . Thanks