I do know that you emotions can cause a lot of stomach upsets.
Root chakra
If this chakra is blocked an individual may feel fearful, anxious, insecure and frustrated. Problems like obesity, anorexia nervosa, and knee troubles can occur. Root body parts include the hips, legs, lower back and sexual organs.
Sacral Chakra.
If this chakra is blocked a person may feel emotionally explosive, manipulative, obsessed with thoughts of sex or may lack energy. Physical problems may include, kidney weakness, stiff lower back, constipation, and muscle spasms. Belly body parts include sexual organs (women), kidneys, bladder, and large intestine.
Solar Plexus.
Physical problems may include digestive difficulties, liver problems, diabetes, nervous exhaustion, and food allergies. When balanced you may feel cheerful, outgoing, have self-respect, expressive, enjoy taking on new challenges, and have a strong sense of personal power. The body parts for this chakra include the stomach, liver, gall bladder, pancreas, and small intestine.
Heart
When this chakra is out of balance you may feel sorry for yourself, paranoid, indecisive, afraid of letting go, afraid of getting hurt, or unworthy of love. Physical illnesses include heart attack, high blood pressure, insomnia, and difficult in breathing. When this chakra is balanced you may feel compassionate, friendly, empathetic, desire to nurture others and see the good in everyone. Body parts for the fourth chakra include heart, lungs, circulatory system, shoulders, and upper back.
Throat
The throat is where anger is stored and finally let go of. When this chakra is out of balance you may want to hold back, feel timid, be quiet, feel weak, or can¹t express your thoughts. Physical illnesses or ailments include, hyperthyroid, skin irritations, ear infections, sore throat, inflammations, and back pain. When this chakra is balanced you may feel balanced, centered, musically or artistically inspired, and may be a good speaker. Body parts for the fifth chakra are throat, neck, teeth, ears, and thyroid gland.
Third Eye
hrough the power of the sixth chakra, you can receive guidance, channel, and tune into your Higher Self. When this chakra is not balanced you may feel non-assertive, afraid of success, or go the opposite way and be egotistical. Physical symptoms may include headaches, blurred vision, blindness, and eyestrain. When this chakra is balanced and open you are your own master with no fear of death, are not attached to material things, may experience telepathy, astral travel, and past lives. Sixth chakra body parts include the eyes, face, brain, lymphatic and endocrine system.
Crown
It is located just behind the top of the skull. It is the center of spirituality, enlightenment, dynamic thought and energy. It allows for the inward flow of wisdom, and brings the gift of cosmic consciousness. This is also the center of connectedness with the Goddess (God), the place where life animates the physical body. The silver cord that connects the aura bodies extends from the crown. The soul comes into the body through the crown at birth and leaves from the crown at death. When this chakra is unbalanced there may be a constant sense of frustration, no spark of joy, and destructive feelings. Illnesses may include migraine headaches and depression. Balanced energy in this chakra may include the ability to open up to the Divine and total access to the unconscious and subconscious.
Hope this is of some help.
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... knotted sort of feeling in either solar plexus or throat chakras, which I seem to be able to get rid of by imagining light clearing them out. Maybe that's it? 
