You can see a marriage counselor without your DH. It is up to you wether or not you tell him you are going. You can go and tell him that he is welcome to accompany you anytime. If you are a church Member you can also talk to your Pastor/ Spitritual couselor.
You can also go to thew Library or bookstore and pick up some "self help" type books on Marriage.
Seven principle fopr making marriage work by John Gottman is a good one- DH and I found this book very helpful.
I don't know about your personal life but do you or DH have any issues with alcoholism-self, parent, child, sibling of an alcoholic etc... I have found Al-anon to be my salvation at times.
It sounds like your feeling depressed also take a look at a depression screening tool like this link-
http://psychcentral.com/depquiz.htm
Make an appt with you Primary care Physician and talk about your results and how you feel. Your primary care Dr. Maybe needs to check your Thyroid function.
Make sure your getting regular exercise of 30 minutes a day, at least 15 minutes of sun exposure daily or/and Vitamin D/Calcium Suppplement. Cut back on Carbohydrtae consumption, increase protein, fruits and vegetables.
Get on BYC and Rant when you need to!!!!!!