Sarah, it is no surprise you are suffering from depression! What you have had to cope with the past few years, the ups and downs, highs and lows and lows.
Many times, depression starts with just feeling bad or sad about some event in your life. You try to cope with it and soon you appear to be back to your old self again. But you may still be coping with the event on the inside. Then something else comes along to send you into another sustained period of stress and sadness. The next time, it's harder to get through the difficulty. You go back to your "normal" life but the fallout from these sad, stressful events is lurking closer to the surface. It's kind of like oil on concrete. It appears solid on the surface but the oil begins to change the chemical makeup of the concrete and erode the stability until, eventually, there is a big hole in the garage floor.
Your emotional concrete has been eroding for a few years and by the time you realize there is something wrong, the 'oil' has already seeped in and changed your chemical makeup. That's what's called chemical or clinical depression. Once you reach that point, you need intervention to help you find your stasis (balance) point again. Sometimes, just being able to talk to a therapist and unload your burden and find help and a sympathetic ear to help you understand what's going on can be all you need to get you through and back on track. Sometimes, if your depression is extreme, you may need chemical help (anti-depressant) for a short period (3 or 6 months or a year or two)to help you recover. If your depression is severe, it may require long-term (lifelong) drug intervention to help you deal.
Many people don't realize how much every little emotional shift effects your body's chemical balance. But you can feel the tiny shift inside when your baby takes his first step or he brings home his first 'A' to show you, or - on the other side - the first time he falls down and hurts himself and comes to you with tears in his eyes and a "boo boo" on knee. Everything we experience changes the chemical balance in our body.So it is understandable that such a torrent of highly emotional events in your life would leave you feeling overwhelmed and unable to cope. That depression will make you tired; make you cry for no apparent reason. You stop caring and stop taking care of yourself. It becomes too much trouble to take a bath and, before you know it, you can't even get out of bed anymore.
Sadly, more people than you might imagine suffer from untreated depression. Too many (uninformed) people still see some stigma attached to it. ("If you are depressed you must be crazy," kind of mentality.) The truth is, seeking help, the first step back, is the smartest, sanest, least crazy thing a person can do.
If you can't afford a therapist (you will need to see a psychiatrist NOT a psychologist if you require an anti-depressant prescription) contact your county health department for the closest mental health clinic. Do it soon. You deserve some peace of mind and you are worth so much more than the pain you are currently suffering. Please keep us posted and let us know how you are progressing.
Best of luck to you and God bless you.