Do you think it is possible to feel so distressed by a situation that the emotional pain and stress manifest as physical symptoms?
The answer to that is yes they certainly can. I don't know you history or if a certain event or a build up of evens is causing this but Stress or distress could be causing it. Rather than it actually being depression as already said. It is good and important that you have recognised this now because it means you can find different ways of coping or handling things or people.
If you can pinpoint a or a few triggers, is there a way of dealing with them? Often though it is a build up of things you can do bugger all about and it is finding ways that you can deal and with them.
Often an important way of dealing with things is talking. Sometimes this can help get things into proportion. Some people find they have a partner, friend, relative who is good at listening other times it may be with asking for a professional to talk to either by you Health visitor if you have a child or going down the counselling route which you should be able to get via your GP.
Writing things down and keeping a diary can also sometimes help you get things straight in your head, put things in perspective, and even work out your own solutions.
Other things that can help is exercise as it helps your body produce chemicals that effect mood, concentration and sleep. It can be gentle like walking (outside and sunshine is very good) swimming etc or if you need something to take out a bit of anger and aggression on then something like kick boxing may be appropriate. You can get something called exercise on prescription, it is worth asking your GP about, you get assessed by a personal trainer, who works with you a programme which is appropriate for you and monitors your progress.
The other side of exercise is relaxation, something as simple as getting time to your self to have a bath and pamper yourself can help as can more formal forms such as visualisation, meditation, yoga, Ti Chi.... If you want to try a guided relaxation there is a free one you can download onto an MP3 player from Living Life to The Full it is a online CBT site (you may find some sections of that helpful too in the Review the Living Life Modules there is Building Confidence,Practical Problem Solving, Being Assertive, Exercise and Healthy Living, Sleeping Better Staying Well, 2 on Anxiety Control, then in) You do have to join bit it is free and you can opt out of email stuff so you do not end up with a lot of crap. You will find downloads under the second tab called down the side called Course Resources.
The other area which sometimes gets forgotten when you are stressed is diet often because appetite is one of the things that is effected. It is important to try to eat a balanced healthy diet. This does not mean that you cannot eat things you enjoy but make sure you have plenty of fresh fruit and veg proteins and carbs. If you have a poor appetite a the moment try eating small, regular meals 4-5 times a day rather than struggle to eat 2-3 big ones. This can also help keep your blood sugars more even ad sometimes dips in blood sugar can effect your mood (sugary foods and drinks can also cause large peaks and troughs in your blood sugar). It may be worth considering a vitamin mineral supplement something that contains a good range of B vitamin complex, Vitamin C Vitamin E Magnesium, Calcium, magnesium, Chromium, Selenium, Iron, Zinc... Might also be worth looking at Omega 3 6 and 9 oils
Links on stress
www.helpguide.org/mental/stress_signs.htm
www.nhsdirect.nhs.uk/articles/article.aspx?articleId=350§ionId=10
www.stress-symptoms.org
www.netdoctor.co.uk/diseases/facts/stressdealingwithit.htm
www.stressfocus.com/stress_focus_article/symptoms-of-stress.htm
www.stressbusting.co.uk/articles/stress-signs-and-symptoms/
www.teamtechnology.co.uk/tt/t-articl/stress.htm
Links on diet and food
depression.about.com/cs/diet/a/vitamin.htm (not saying you have depression just same things can help)
www.mind1st.co.uk/omega-3-6-9.asp
www.aboutomega3.com/omega_3_depression_been_feeling_down_and_depressed.html
www.lowgidiet.net/pages/lowgiwhy.shtml
www.the-gi-diet.org
www.healthyplace .com/Communities/Depression/treatment/alternative/brain_chemistry.asp
ezinearticles.com/?Usi ng-Vitamins-And-Minerals-For-Depression&id=655001
www.whfoods.com/nutrientstoc.php?PHPSESSID =aa18536dc388773f6da985c9a4c6070a
www.eatwell.gov.uk/healthydiet/nutritionessentials/vitamin sandminerals
www.medicinenet.com/vitamins_minerals_and_nutritional_supplements/article.htm
ods.od.nih.gov/Health_Information/Vitamin_and_Mineral_Supplement_Fact_sheets.aspx