Swallowing Nails
Scholars have said that whoever sees themselves swallowing iron nails, thorns, or stones, and feels roughness in their throat apart from food and drink, they may swallow anger commensurate with the difficulty of what they swallowed. If what they swallowed was rough food or drink, it may indicate a disturbance in their life, livelihood, and earnings. However, if what they swallowed was soft and sweet, it indicates a good life and livelihood, unless it was something disliked in interpretation, such as fruits and vegetables that symbolize worry.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam