All my BTC is gone all of the sudden. Need help

Posted this on r/CryptoCurrency, but the mod decided to take it down for whatever reason, and i can't post on r/Bitcoin bc apparently the mods banned me. so here i am

Alright.. I have a lot of my assets on my coinbase wallet. I had all my btc on there. I checked today and yup it's all gone. Doesn't show any transaction history or anything. I can't believe this. I don't know how it happened. I don't know if it's a bug or if someone stole it. My seed phrase is with me in person, not stored anywhere online. A while ago I checked my eth balance and it all disappeared, but came back when i refreshed the app. I've done that multiple times right now and nothing.

What should I do? Any tips? Anyone have a similar situation? this is pretty frustrating. i was fine with all my shit on the exchanges and it seems like even wallets just as risky I updated the app and nothing else.

Thanks