I need advice asap

I’m 17 years old, lately I’ve been waking up in the middle of the night with shortness of breath having nauseas all the time and losing lots of weight and I’m always tired and sleeping I hardly even eat because if I try I’ll start gagging and itll make me throw up. My mom is never home she’s always busy and I’m always by myself at home, I feel really sick but once I tell my mom about it she will tell me that I’ll get over it and I’m just being dramatic like every other time I’ve felt sick. What do i do!? I seriously feel like I need help it’s not only a night thing it also happens a lot during the day. Shortness of breath, nauseas, dizziness, lots of sleep and loosing weight. Please help me