I need your help

So basically I haven't been feeling very well lately and it's not been nice? I've been tired all the time ( I slept from 5pm to 9am the other night) I don't know if it's just me or am I the only one that thinks that's a bit too long? Defo for me!! Maybe it's because I'm stressed out I wondered but then I started realising other things like major headaches all the time, going from cold to hot in 10 seconds,frequent toilet trips?#1, feeling super sick and loosing loads of weight suddenly? Although I did loose interest in food for about 4-5 days! I was just wondering if it's something I need to see a doctor about? I got told maybe it's something like anemia ? But I'm not sure,can any of you help? Thanks x