I am experiencing difficulties physically and emotionally, i am constantly sad and irritable, i snap at the littlest things, i need advice?

Get evaluated : First get a professional evaluation of your problems — in person, not over the internet. With both physical and emotional issues, your primary care doctor may be a good first step. Or see a mental health professional. Sometimes talking things out helps more than you'd expect, and if medication or other treatments are needed, you can get that too. Good luck.

See below: There's a variety of potential causes/contributions to physical and emotional distress. A possible emotional reaction to these difficulties is irritability and reduced frustration tolerance (eg "a shortened fuse") which itself can contribute to further emotional distress by virtue of its interpersonal impact. Would consider discussing concerns in person with a medical and/or mental health provider.

Maybe depressed?: Being constantly sad and irritable - and snapping at things that wouldn't ordinarily bother you - may be signs of depression. Fatigue, a sense of hopelessness, and a lack of interest in things you normally enjoy are other symptoms. The most concerning, of course, are thoughts of suicide or other self-harm. Please contact your doctor, or the crisis clinic. Depression is highly treatable. Good luck.